Each edition grades its towns against each other only.
Derry Township dates its founding to 1775 (Wikidata). The census first counted it in 2000.
Derry Township was named after the city of Derry in Northern Ireland.
More historic than 76% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Derry Township is more historic than 76% of U.S. towns. Its age holds the grade up; its National Register listings pull it down.
Pennsylvania towns list about as much on the Register as the country (a typical Pennsylvania town has 2.1 per 10,000 residents, the U.S. 2.4), so Derry Township’s 0.0 sits below most of its state (25% of Pennsylvania towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
Founding year: Wikidata (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
Read from the archive, the National Register and the record. The page puts what stands out first.
The first neighbors to add old photos shape how Derry Township’s history is told.
Woven from the archive, old maps, post office records, the National Register and the people born here.
On the mapFirst mapped by the U.S. Geological SurveyWikipedia doesn’t have a history of Derry Township yet. The photos, dates and memories neighbors add here are how it gets written.
Derry Township is a township in Montour County, Pennsylvania, United States. It was named after the city of Derry in Northern Ireland.
Derry Township was established in 1775. Between the 2010 and 2020 censuses its population fell from 1,130 to 1,096 (-3%).
Intro from Wikipedia. Population: U.S. Census Bureau.
2023Montour Generating Station from Blee Hill Road, July …
2021Winter Sunset Silhouettes - Flickr - fishhawk
2015Power lines in Derry Township, Montour County, Pennsy…
2015Mud Creek looking downstream from Ppl Road
2014Field in Derry Township, Montour County, Pennsylvania
2014Chillisquaque Creek in Derry Township, Montour CountyEvery edition of the U.S. Geological Survey’s map of Derry Township. Tap a year, or press play to watch the town change.
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Derry Township.
Between 1,090 and 1,215 people in every census since 2000.
3 censuses, 2000–2020.
U.S. Census Bureau decennial counts, from the census table on Derry Township’s Wikipedia page.
Nobody well known was born in Derry Township itself, so here are the best known from just nearby.
Another post office, Strawberry Ridge, opened and closed inside today’s town.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Each neighbor’s History grade, on the same three inputs.
In 1775, according to Wikidata. Derry Township’s post office opened in 1891, and the census of 2000 counted 1,215 people here.
Derry Township is more historic than 76% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
24% of Derry Township’s homes were built before 1940 (Census estimate, ±10.3 points), against a typical 18% for a Pennsylvania town; the median home was built in 1976.
What the archives can’t tell you, neighbors can.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).
From Wikimedia Commons (6), U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
